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Document that overflow in P[X+k:n] terminates a filter program. 

Based on a discussion with Christos on source-changes-d.
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alnsn 2011-12-30 14:12:15 +00:00
parent 4b4a4e64bb
commit 209a072285
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4
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@ -1,6 +1,6 @@
.\" -*- nroff -*-
.\"
.\" $NetBSD: bpf.4,v 1.48 2011/12/27 21:47:04 wiz Exp $
.\" $NetBSD: bpf.4,v 1.49 2011/12/30 14:12:15 alnsn Exp $
.\"
.\" Copyright (c) 1990, 1991, 1992, 1993, 1994
.\" The Regents of the University of California. All rights reserved.
@ -515,6 +515,8 @@ halfword
.Sy ( BPF_H ) ,
or byte
.Sy ( BPF_B ) .
Arithmetic overflow when calculating a variable offset terminates
the filter program and the packet is ignored.
The semantics of all the recognized BPF_LD instructions follow.
.Bl -column "BPF_LD_BPF_W_BPF_ABS" "A \*[Lt]- P[k:4]" -offset indent
.It Sy BPF_LD+BPF_W+BPF_ABS Ta A \*[Lt]- P[k:4]